Table 2. The variance inflation factors and tolerances multicollinearity analyze of factors.
| Factor | Before | After | ||
|---|---|---|---|---|
| Tolerance | VIF | Tolerance | VIF | |
| elevation | 0.641 | 1.559 | 0.642 | 1.559 |
| slope aspect | 0.944 | 1.060 | 0.956 | 1.046 |
| slope angle | 0.708 | 1.412 | 0.709 | 1.411 |
| plan curvature | 0.085 | 11.744 | - | - |
| profile curvature | 0.086 | 11.656 | 0.601 | 1.664 |
| mean annual rainfall | 0.884 | 1.131 | 0.900 | 1.111 |
| distances to faults | 0.842 | 1.188 | 0.849 | 1.178 |
| distance to rivers | 0.494 | 2.026 | 0.489 | 2.043 |
| distance to roads | 0.730 | 1.370 | 0.494 | 2.025 |
| river density | 0.488 | 2.047 | 0.743 | 1.345 |
| road density | 0.703 | 1.423 | 0.707 | 1.414 |
| NDVI | 0.015 | 67.736 | 0.809 | 1.235 |
| ULI | 0.010 | 95.424 | - | - |
| NDWI | 0.043 | 23.519 | - | - |
| lithology | 0.723 | 1.383 | 0.736 | 1.359 |
| soil watery degree | 0.810 | 1.235 | 0.815 | 1.227 |